Extensive research into alkali-activated slag as a green gel material to substitute for cement has been done because of the advantages of low-carbon dioxide emissions and recycling of industrial solid waste. Alkali-activated slag usually has good mechanical properties, but the too fast setting time restricted its application and promotion. Changing the composition of alkaline activator could optimize setting time, usually making it by adding sodium carbonate or sodium sulfate but this would cause insufficient hydration reaction power and hinder compressive strength growth. In this paper, the effect of sodium aluminate dosage as an alkaline activator on the setting time, fluidity, compressive strength, hydration products, and microstructures was studied through experiments. It is fair to say that an appropriate amount of sodium aluminate could obtain a suitable setting time and better compressive strength. Sodium aluminate provided enough hydroxyl ions for the paste to promote the hydration reaction process that ensured obtaining high compressive strength and soluble aluminium formed precipitate wrapped on the surface of slag to inhibit the hydration reaction process in the early phase that prolonged setting time. The hydration mechanism research found that sodium aluminate played a key role in the formation of higher cross-linked gel hydration products in the late phase of the process. Preparing an alkali-activated slag with excellent mechanical properties and suitable setting time will significantly contribute to its application and promotion.

中文翻译：

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铝酸钠作为固体碱性活化剂的用量对碱活化矿渣浆料性能的影响

由于低二氧化碳排放和工业固体废物的回收利用的优势，已经进行了广泛的研究，以碱活化炉渣作为绿色凝胶材料来替代水泥。碱活化矿渣通常具有良好的机械性能，但是凝固时间过快限制了其应用和推广。改变碱性活化剂的组成可以优化凝固时间，通常通过添加碳酸钠或硫酸钠来使其凝固，但这会导致水合反应能力不足并阻碍抗压强度的增长。通过实验研究了铝酸钠作为碱性活化剂对凝固时间，流动性，抗压强度，水合产物和微观结构的影响。可以说，适量的铝酸钠可以获得合适的凝固时间和更好的抗压强度。铝酸钠为糊料提供了足够的氢氧根离子，以促进水合反应过程，从而确保获得高的抗压强度，可溶性铝形成的沉淀物包裹在炉渣表面，从而在早期抑制了水合反应过程，从而延长了凝固时间。水合机理研究发现，铝酸钠在该过程的后期阶段在形成较高交联的凝胶水合产物中起关键作用。制备具有优异机械性能和合适凝结时间的碱活化炉渣将大大有助于其应用和推广。铝酸钠为糊料提供了足够的氢氧根离子，以促进水合反应过程，从而确保获得高的抗压强度，可溶性铝形成的沉淀物包裹在炉渣表面，从而在早期抑制了水合反应过程，从而延长了凝固时间。水合机理研究发现，铝酸钠在该过程的后期阶段在形成较高交联的凝胶水合产物中起关键作用。制备具有优异机械性能和合适凝结时间的碱活化炉渣将大大有助于其应用和推广。铝酸钠为糊料提供了足够的氢氧根离子，以促进水合反应过程，从而确保获得高的抗压强度，可溶性铝形成的沉淀物包裹在炉渣表面，从而在早期抑制了水合反应过程，从而延长了凝固时间。水合机理研究发现，铝酸钠在该过程的后期阶段在形成较高交联的凝胶水合产物中起关键作用。制备具有优异机械性能和合适凝结时间的碱活化炉渣将大大有助于其应用和推广。